---- Allen <[email protected]> wrote: > On Fri, 2010-10-08 at 04:12 +0000, Frank D wrote: > > > > - > > > > > > > If I understand you right, you want to recieve mail on one of the machines? > > Or are they going outside of your network? I'm pretty sure you don't even > > need a MTA (mail transfer agent, ie sendmail) with smartd, etc. if it's > > going to another machine. Though I've never had a machine without an MTA, > > or looked to see exactly how they send mail.. so I couldn't say for certain. > > > > > > Frank DiMitri > > Frank, it looks like you're correct. I happened to be reading today an > article called "Pernicious Ports" > http://www.berghel.net/col-edit/digital_village/dec-05/dv_12-05.php > > =========================================================================================================================================================== > > (2) Unix-Centric > > Most UNIX systems, regardless of brand, offer SMTP mail services through > TCP port 25. If the system is not actually a mail relay or server, then > you likely do not need this service running at all. The main exposure > lies in the failure to continuously patch the system. By the way, it is > a common misconception that an SMTP server must be running for a local > user or service to send email out of a UNIX box. This is simply not > true. The recommended solution is to block TCP 25 at the firewall.
SMTP is very simple, you don't need an SMTP server to SEND a message. Lots of programs/scripts will just do this themselves. Opening a TCP connection and setting up some basic stuff to send to a destination SMTP server is not hard. SMTP is a plain-text protocol. Some will pipe their output to a common program (I think 'mail' is used for this a lot) in order to send a message to another machine. I could be wrong about the program that's used. Frank DiMitri _______________________________________________ Mid-Hudson Valley Linux Users Group http://mhvlug.org http://mhvlug.org/cgi-bin/mailman/listinfo/mhvlug Upcoming Meetings (6pm - 8pm) MHVLS Auditorium Nov 3 - Open Source Hardware: Bugs, Beagles and Beyond Dec 1 - IBM's Open Client Deployment Jan 5 - Building a Comunity Site with Drupal
